重點講解：
1. sign up for
（和…）簽約；雇用；報名（參加課程）；
eg. Many men sign up for the army because they can not get ordinary jobs.
由于找不到工作，許我男人都報名參了軍bRn5Z)Lu*F2Oyf。
eg. Her parents urged her to sign up for a computer course.
父母督促她報名參加計算機課程~C%99iOm%k3]。
2. opposite sex
異性；
eg. These people, usually men, seem unable to relate to the opposite sex.
這些人，通常為男性，似乎不懂得如何跟異性相處9JNkg[o|~)qN。
eg. Body language can also be used to attract members of the opposite sex.
肢體語言也可以用來吸引異性的注意rh#HwK1hS0znwk。
3. lose one's head
不知所措；頭腦發昏；沒主意；慌里慌張；
eg. He was not a man to lose his head in an emergency.
他這個人在緊急情況下是不會糊涂的ycXGVr~]h6(,=eL。
eg. I never thought that I was gonna lose my head
我從沒想過我會不知所措G@04fU5wtd&QJ。